The word Sir is the same word used in verse 11 (see there).
Said is literally “said to him,” but in English “to him” is unnecessary in the context.
Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on the Gospel of John. (UBS Handbook Series). New York: UBS, 1980. For this and other handbooks for translators see here .